public function get_ontology_display_name_from_uri($uri)
 {
     global $opac_url_base;
     $display_name = "";
     if (strpos($uri, "skos") !== false) {
         $display_name = "http://www.w3.org/2004/02/skos/core#prefLabel";
     }
     if (strpos($uri, $opac_url_base . "ontologies/") !== false) {
         $ontology_id = substr(str_replace($opac_url_base . "ontologies/", "", $uri), 0, strpos(str_replace($opac_url_base . "ontologies/", "", $uri), "#"));
         $ontology = new ontology($ontology_id);
         $display_name = $ontology->get_display_label_property($uri);
     }
     return $display_name;
 }